Pennsylvania cudweed

''Gamochaeta pensylvanica'', called Pennsylvania cudweed or Pennsylvania everlasting, is a widespread species of flowering plant in the sunflower family. It is native to South America and introduced into Eurasia, Africa, Australia, and North America. The ''pensylvanica'' epithet is a misnomer, as the plant is not native to Pennsylvania and only marginally naturalized there.

''Gamochaeta pensylvanica'' is an annual herb up to 50 cm tall. Leaves are up to 7 cm long, light green because of woolly hairs on the surfaces . The plant forms many small flower heads in elongated arrays. Each head contains 3–4 purple disc flowers but no ray flowers.